Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


This is the Engineered Nano-Particle Modeling tool developed for the Consumer Product Safety Commission.

Access Web App:


This web-based tool can be used to calculate exposure to a single-size particle within a single zone. The basic transport processes captured by the model are depicted in the figure below. They include particle generation by a source, surface deposition and resuspension, transport via airflow, and filtration.

model depiction

The tool was developed to take advantage of ContamX, the simulation engine of CONTAM, which is run by the web interface as client-side javascript implementation. Details of the tool are provided in the following document.



Indoor Air Quality Group

Created March 12, 2019, Updated November 15, 2019